Pulley



' (No Model.) 2 sneens-sheeg 1 G. E. BURT.

PU'LLBY. l 1 No. 416,561. a, 1889.

UNITED- STATES PATENT OFFICE.

GEORGE EDWARD BURT, OF HOWARD, MASSACHUSETTS.

PU LLEY.

SPECIFICATION forming part of Letters Patent No. 416,561, ydated December 3, 1889.

v Application tiled March 2v, 1889. Serial No. 301,735. (No model.)

l split or sectioned pulleys, the objects being to provide a pulleyin which the lags are not 1 connected together or to the spokes by glue or nails, but are bound together by metal rods or bars and nuts on the same, in which the parts can be quickly and easily separated y for repair or other necessary or desired purpose, which can be quickly secured on shafts Y of different diameters, in which the danger of explosion by centrifugal force generated by rapid revolution will be avoided, which can be used either in a Wet or dry atmosphere without injury, and which can have its face turned off smooth and true without danger of injuring the edge of the turning-tool; and it consists in the construction and novel combination of parts hereinafter described, illustrated in the accompanying drawings, and pointed out in the appended claims.

In the accompanying drawings, Figure 1 is a' side view of a pulley embodying the invention. Fig. 2 is a central section of the inner portion thereof at right angles to the compound spoke. Fig. 3 is a section of onehalf of the pulley parallel to its sides. Fig. 4 is a detail section on the line x w of Fig. 2. Fig. 5 represents views of the end lag of a section and the part of the spoke that fits therein. Fig. 6 is a side view of one of the seniicircular rods detached with the nuts engaged on its ends. Fig. 7 is an edge view of one of the lags. Fig. 8 is a perspective view of the pulley.

Referring to the drawings by letter, A designates a shaft, and B a pulley fitted thereon and embodying the invention.

The pulley consists of two similar sections, each composed of one-half of the rim and one- 'half of a longitudinally-divided 'double or compound spoke C, the sections c of which have their central parts c in block form or rectangular and have on their inner flat fac'- ing sides the transverse central grooves c2, having flat sides that form right angles at the bottoms of the grooves,which serve a purpose hereinafter explained. The end portions of the spoke-sections,which are squared, have on their outer surfaces transverse grooves c3, triangular in cross-section to bind them to the rin1,which they enter, the ends of the spoke-sections being flush with thev outer surface of t-he rim.

D D are similar rim-sections, very nearly semicircular, and composed of the transverse lags d, set edge to edge. The end lags d of each section are provided with transverse ribs cl2, triangular in cross-section, to t and bind in the corresponding grooves c3, and d3 designates one or more perforations or passages extending through each rim-section concentric with its curved faces or surfaces and through corresponding perforations in the adjoining spoke-section.

E E are curved rods or wires or steel bars extending through the channels d3 and having their ends threaded outside thereof, and e e are nuts engaging said ends and binding the lags together and to the spoke-sections. Any other equivalent means for connecting the spokes and lags may be used. yThese rods or bars constitute, as it were, backbones for the pulley. It is evident that by means of said nuts and rods the said parts may be held very securely together, so that the pulley will not explode, but will resist the centrifugal force generated by a very rapid rotation. If desired, the edges of the lags may be provided with transverse meeting grooves e', into which are fitted the keys e2 to bind the lags more firmly together.

F F are blocks inserted between the :facing ends of the rim-sections, and are, if desired, keyed to the end lags in the same manner as the lags are keyed together. The said blocks are provided with openings ff, registering with the channels cl3 and adapted to receive the nuts e and threaded ends of the rods E. The central squared parts of the spoke-sections have, preferably, on their outer longitudinal corners or edges angle-re-enforcing plates Gr, through openings in which and in the spoke-sections pass the bolts g, the thread- IOO ed ends of which are engaged by the nuts y" The aligleplates are provided in their instanding flanges with rectangular notches g3, that register with the ends of the grooves ci, and are of equal size thereto. By the said bolts and nuts the whole pulley is bound firmly together and the pulley clamped on the shaft. If desred,the spoke-sections may be connected with bolts on each side of their central parts c.

II II are angle-wedges, or wedges that are bent at right angles centrally and longitudinally, there being four of said wedges, two on each side of the pulley. The said wedges lie opposite each other in the grooves c2 and notches g2, and are tapered from their outer to their inner ends, those on one side binding upon the shaft A, while those on the opposite side ride upon the former, the beveled or tapered sides of the opposite sets being in contact. The outer ends of said wedges have secured to them, by screws or otherwise, the arms 7l, to theinner ends of which are secured the oppositelythreaded nuts f1', the inner edges of which are curved to fit and ride on the shaft A, that aids in holding them in posi tion.

I is a bolt having a central smooth portion and oppositelythreaded end portions, which threads respectively engage the nuts 'L'.

To secure the pulley in place or to tighten it, a rod t" is inserted in an opening in one'of the projecting ends of the bolt I and the latter turned in the proper direction to cause the nuts 'L' to approach each other, thus driving the wedges Il farther inward and causing them to bind between the shaft and the sections of the compound spoke C. The op" posite rotation of the bolt of course loosens the pulley on the shaft.

I is a supporting-sleeve surrounding the central smooth part of the bolt I, and with its outstanding tongue i2 secured to one of the spoke-sections.

It is evident from the foregoing that the pulley may be secured upon shafts of different diameters, the distance that the anglewedges are driven inward varying with the diameter of the shaft. It is also evident from the described construction that the pulley can quickly and easily be mounted on and dismounted from a sha-ft, and that it can be readily taken apart for any necessary purpose. It can also be tightened or loosened with extreme ease and quickness. As its tread is perfectly free from glue or nails, it cannot easily injure the edge of aturningtool when re-dressing it.

The rods E, which are of steel and which bind the lags and spokes of the sections together, render it almost impossible for the pulley to explode however rapid its rotation, and, as there is no glue to soften nor no nails to rust and loosen, it is evident that the pulley will work equally well in all kinds of weather.

This pulley is equally practical in wet locations, where rubber belts only could be used; or, in uncommon drylocalities, if the lags shrink, the screw-nuts on the semicircnlar bars or rods may be readily screwed down, drawing all the lags and firmly bind together spokes and The rods and keys hold the lags so they cannot warp or twist, but always present a uniform surface for the lbelts to run on in the best position of the timber to give the belts the most drawing power on the pulley. Any desirable number of rods or spokes may be used that the size or width of face ofthe pulley require. It will be readily seen that a light cheap strong pulley is made fitted for various localities and is weather-proof.

l'laving described my invention, I claim- I. A sectioned pulley comprising two equal sections, each composed of one section of a longitudinally-divided spoke and a rim-seetion, the rim-sections being composed of transverse lags and provided with perforations or passages parallel tottheir faces that extend through the ends of the spoke-sec tions7 rods extending through said perforations or passages, and nuts engaging the threaded ends of said rods outside the channels, snbstantially as specified.

2. In asectioned pulley, the combination of the spoke-sections having in their squared end portions the transverse grooves c3, the rimsections composed of the transverse lags A and provided with perforations or passages concentric with their curved faces or surfaces, that also extend through the corresponding spoke-sections, the end lags A', provided with transverse ribs to enter and fit in the corresponding grooves ci, the rods extending through the perforations or passages in the rim-sections, and the nuts engaging the threaded ends of said rods outside of said perforations or passages, substantially as specified.

3. In a pulley, the combination of the equal sections, each composed of the spoke-section c, the lags A, fitted together at their edges IOO IIO

and. provided with meeting grooves c in said edges, the keys e2, fitted in said meeting grooves, the rods E, extending through the perforations or passages in the rim-section and corresponding spoke-section, and the nuts engaging the threaded ends of said rods outside of said channels, substantially as specified.

4. In a diametrically-sectioned pulley, the combination of the longitudinallyfdivided spoke, the lags forming the rims of the sections, the rods extending through perforations or passages in the rims and adjacent spoke sections, the nuts engaging the threaded ends of saidrods outside of said channels, the blocks between the rim-sections provided with openings to receive said ends and nuts, and the bolts passing through registering openings in the two spoke-sections and binding the two pulley-sections together, substantially as specified.

o. The combination, with theriln and the longitudinally-divided spoke C, having the opposite central grooves c2 in its facing sides, which grooves are right-angled at the bottoms, of the binding angle-wedges restingrin said grooves and binding on the shaft, and means, substantially as described, whereby the two set-s of wedges may be simultaneously forced inward or outward, substantially as specified.

G. The combination, with the rim, the longitudinally-divided compound spoke C, provided with the central transverse grooves c2, and the bolts holding the spoke-sections together, of the angle-wedges arranged in two opposite sets, the arms h, attached to the Wedges, the oppositely-threaded nuts i, attached to the arms, and the bolt I, engaging said nuts, substantially as specified.

7 The combination, with the rim, the longitudinally-divided spoke @provided with the grooves c2, and the bolts holding the spokesections together, ofthe angle-Wedges, the arms .71., the oppositely-threaded nuts t', the

bolt I, and the supporting-sleeve I', with its outWardly-'extending tongue secured to one threaded at their ends, the lags iitted edge- Wise together, the spoke-sections, the spokesections and lags having registering perforal tions for the reception of the said rods, the nuts engaging the ends of the rods, and the bolts binding the two spoke-sections together, substantially as specified.

In testimony whereof I afx lny signature in presence of two witnesses.

GEORGE ED\VARD BURT.

XVitnesses:

E. E. BURT, G. F. WHITNEY.

'v It is herebyfcertied that the residence of the patentee in Letters Patent N o. 416,561, granted December 3, 1889, upon the application of George Edward Burt, for an improvement in Pulley/s, Was erroneously Written-and printed Howard, Massachusettsf that said residence should have been Written and printed Harvard, lllassaehfav setts; and thatthe said Letters Patent'shouid be read with this correction therein that the same may conform to the record of the` case in the Patent Ofce.

Signed, conntersigned and sealed this 11th day of February, A. 1).1890.

CYRUS BUSSEY, Assistant Secretary of the Interior.

[sEALQ] Countersigned C. E. MITCHELL,

Commissioner' of Patents. 

